Finan was from Anaheim, California, and was serving in Iraq with Explosive Ordnance Disposal Mobile Unit 3 in an advisory capacity, according to the Pentagon.

"The entire Navy Expeditionary Combat Command family offers our deepest condolences and sympathies to the family and loved ones of the Sailor we lost," said Rear Adm. Brian Brakke, commander of the Navy Expeditionary Combat Command/NECC Pacific, in a news release.

As of early this month, there were 4,565 U.S. troops in Iraq, according to the Pentagon. That doesn't include another 1,500 troops considered there "on temporary duty," whose number changes daily, according to the U.S. officials.

Three other service members have died in Iraq since the U.S.-led coalition began launching airstrikes against IS in August 2014.